Tanzanite is a gem form of zoisite, found only in the Arusha region of Tanzania. Mining is very deep, as gemstones easily go for $250 - $1000+ per carat. Crystals are also produced, of varying quality given largely that anything with a gemmy area within it gets cut. Also most are dinged, so getting pristine specimens is very difficult. Most pieces are heat treated, which mimics the natural geology that gives the crystals that amazing blue-purple color. The mines are incredibly deep and long term future production is in question.

It weighs 21.37 carats (4.27 grams). It is a vibrant blue-purple with remarkable gemminess through out. The termination is pristine. The side near the bottom has a slight sheered spot that under the microscope is a crystallied face, so this happened while in the pocket and still growing.(it's very hard to spot) The main front face has some raised triangles (known as screw distortions to geologists), overall a great crystal, with flashes of purple when looking at it from the side.

DIOPSIDE7 - Diopside
$ 1600.00 (=~ £ 1292.08) NET
Merelani Hills, Lelatema Mtns., Arusha Region, Tanzania
miniature - 4 x 3.6 x 2.7 cm

This large beautiful Diopside is bright apple-green, lustrous and without damage. Diopside from Merelani of this size is very unusual, especially with the great color. no damage.

 

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(click on the picture to enlarge)

DIOPTASE1 - Dioptase
$ 650.00 (=~ £ 524.91)
Altyn-Tyube, Karagandy Oblast, Kazakhstan
cabinet - 15 x 9 x 7 cm

This is a large dramatic example of Dioptase. It exhibits the best color from Kazakhstan, a rich emerald green. The dioptase from here is typically formed in seams within the host rock, and the crystals are commonly small, but intensely brilliant. 972 grams/ over 2 pounds. (I'm not quiting my day job to become a hand model, it just helps to know how large this piece is).